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Great write-up, I had no idea that China was using machine learning to detect VPN setups...

I'd suggest the author make their Idea #4 random-padding code open source, but ironically if it became popular then surely the ML-based filters would eventually cripple it...




Some VPN configurations appear trivially easy to detect:

https://news.ycombinator.com/item?id=9949559


Shadowsocks/proxy are easy to detect, just try connect to famous default ports like tcp 1080.




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